[interpreter] Minor clean-up of BytecodeSourceInfo.

src/interpreter/bytecode-pipeline.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/bytecode-pipeline.h"
 
 #include <iomanip>
 #include "src/interpreter/source-position-table.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
-void BytecodeSourceInfo::Update(const BytecodeSourceInfo& entry) {
-  if (!entry.is_valid()) return;
-
-  if (!is_valid() || (entry.is_statement() && !is_statement()) ||
-      (entry.is_statement() && is_statement() &&
-       entry.source_position() > source_position())) {
-    // Position is updated if any of the following conditions are met:
-    //   (1) there is no existing position.
-    //   (2) the incoming position is a statement and the current position
-    //       is an expression.
-    //   (3) the existing position is a statement and the incoming
-    //       statement has a later source position.
-    // Condition 3 is needed for the first statement in a function which
-    // may end up with later statement positions being added during bytecode
-    // generation.
-    source_position_ = entry.source_position_;
-    is_statement_ = entry.is_statement_;
-  }
-}
-
 BytecodeNode::BytecodeNode(Bytecode bytecode) {
   DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), 0);
   bytecode_ = bytecode;
 }
 
 BytecodeNode::BytecodeNode(Bytecode bytecode, uint32_t operand0) {
   DCHECK_EQ(Bytecodes::NumberOfOperands(bytecode), 1);
   bytecode_ = bytecode;
   operands_[0] = operand0;
 }
@@ skipping 112 matching lines @@
 }
 
 std::ostream& operator<<(std::ostream& os, const BytecodeNode& node) {
   node.Print(os);
   return os;
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8